body,ul{
    margin: 0;
    padding: 0;
}
#box{
    width: 1280px;
    height: 380px;
    margin:0 auto;
    position: relative;
}
ul{
    list-style:none;
    position: relative;
    width: 1280px;
    height: 380px;
}
ul li{
    width: 1280px;
    height: 380px;
    position: absolute;
    top:0;
    left: 0;
    display: none;
}
#box img{
    width: 1280px;
    height: 380px;
}
button{
    position: absolute;
    width: 50px;
    height: 140px;
    top: 50%;
    margin-top:-70px;
    background: url(../img/lun.png);
    border: none;
    z-index: 10;
}
#pre{
    left: 0;
    background-position: 0 0;
}
#pre:hover{
    background-position: -153px 0;
}
#next{
    right: 0;
    background-position: -51px 0;
}
#next:hover{
    background-position: -102px 0;
}
#dot{
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    text-align: center;
    z-index: 10;
}
#dot .dot{
    display: inline-block;
    *display: inline;
    *zoom:1;
}
#dot span{
    float: left;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #dedede;
    margin-left: 12px;
}
#dot .active{
    background: gray;
}